Bilki, Burak., ve diger2019-03-282019-03-282018PHYSICAL REVIEW LETTERS 121, 082301 (2018)1079-71140031-9007https://doi.org/10.1103/PhysRevLett.121.082301The elliptic azimuthal anisotropy coefficient (v2) is measured for charm (D0) and strange (K0S, ?, ??, and ??) hadrons, using a data sample of p+Pb collisions collected by the CMS experiment, at a nucleon-nucleon center-of-mass energy of ?sNN=8.16??TeV. A significant positive v2 signal from long-range azimuthal correlations is observed for all particle species in high-multiplicity p+Pbcollisions. The measurement represents the first observation of possible long-range collectivity for open heavy flavor hadrons in small systems. The results suggest that charm quarks have a smaller v2 than the lighter quarks, probably reflecting a weaker collective behavior. This effect is not seen in the larger PbPb collision system at ?sNN=5.02??TeV, also presented.enRelativistic heavy-ion collisionsCollective flowArticle10.1103/PhysRevLett.121.0823012-s2.0-8505283761430192601Q1WOS:000442348000004Q1